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GS9090B Datasheet(PDF) 38 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 38 Page - Gennum Corporation |
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38 / 71 page  GS9090B Data Sheet 40749 - 2 January 2007 38 of 71 3.9.6 Automatic Video Standard and Data Format Detection The GS9090B can detect the input video standard and data format by using the timing parameters extracted from the received TRS ID. Total samples per line, active samples per line, total lines per frame, and active lines per field are all calculated and presented to the host interface via the RASTER_STRUCTURE registers (Table 3-9). Also associated with the RASTER_STRUCTURE registers is the STD_LOCK status bit. The GS9090B will set STD_LOCK HIGH when the flywheel has achieved full synchronization to the received video standard. STD_LOCK is stored in the DATA_FORMAT register (Table 3-7). The four RASTER_STRUCTURE registers, as well as the STD_LOCK status bit will default to zero after a device reset, or if the device loses lock to the input data stream (LOCKED = LOW). Table 3-8: Host Interface Description for SMPTE 352M Payload Identifier Registers Register Name Bit Name Description R/W Default VIDEO_FORMAT_OUT_B Address: 10h 15-8 SMPTE 352M Byte 4 Data will be available in this register when Video Payload Identification Packets are detected in the data stream. R0 7-0 SMPTE 352M Byte 3 Data will be available in this register when Video Payload Identification Packets are detected in the data stream. R0 VIDEO_FORMAT_OUT_A Address: 0Fh 15-8 SMPTE 352M Byte 2 Data will be available in this register when Video Payload Identification Packets are detected in the data stream. R0 7-0 SMPTE 352M Byte 1 Data will be available in this register when Video Payload Identification Packets are detected in the data stream. R0 Table 3-9: Host Interface Description for Raster Structure Registers Register Name Bit Name Description R/W Default RASTER_STRUCTURE1 Address: 11h 15-11 – Not Used – – 10-0 RASTER_STRUCTURE1[10:0] Total Lines Per Frame R 0 RASTER_STRUCTURE2 Address: 12h 15-13 – Not Used – – 12-0 RASTER_STRUCTURE2[12:0] Total Words Per Line R 0 RASTER_STRUCTURE3 Address: 13h 15-13 – Not Used – – 12-0 RASTER_STRUCTURE3[12:0] Words Per Active Line R 0 RASTER_STRUCTURE4 Address: 14h 15-11 – Not Used – – 10-0 RASTER_STRUCTURE4[10:0] Active Lines Per Field R 0 |
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